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1da177e4 LT |
1 | /* |
2 | * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org | |
3 | * | |
4 | * Copyright 2001 VA Linux Systems, Inc., Sunnyvale, California. | |
5 | * All Rights Reserved. | |
6 | * | |
c6a1af8a TR |
7 | * Author Rickard E. (Rik) Faith <faith@valinux.com> |
8 | * | |
1da177e4 LT |
9 | * Permission is hereby granted, free of charge, to any person obtaining a |
10 | * copy of this software and associated documentation files (the "Software"), | |
11 | * to deal in the Software without restriction, including without limitation | |
12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, | |
13 | * and/or sell copies of the Software, and to permit persons to whom the | |
14 | * Software is furnished to do so, subject to the following conditions: | |
15 | * | |
16 | * The above copyright notice and this permission notice (including the next | |
17 | * paragraph) shall be included in all copies or substantial portions of the | |
18 | * Software. | |
19 | * | |
20 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
21 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
22 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL | |
23 | * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR | |
24 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, | |
25 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER | |
26 | * DEALINGS IN THE SOFTWARE. | |
27 | */ | |
28 | ||
1b7199fe | 29 | #include <linux/debugfs.h> |
31bbe16f | 30 | #include <linux/fs.h> |
1da177e4 LT |
31 | #include <linux/module.h> |
32 | #include <linux/moduleparam.h> | |
31bbe16f | 33 | #include <linux/mount.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
bee330f3 | 35 | #include <linux/srcu.h> |
85e634bc | 36 | |
c76f0f7c | 37 | #include <drm/drm_client.h> |
85e634bc | 38 | #include <drm/drm_drv.h> |
760285e7 | 39 | #include <drm/drmP.h> |
85e634bc | 40 | |
79190ea2 | 41 | #include "drm_crtc_internal.h" |
e7b96070 | 42 | #include "drm_legacy.h" |
67d0ec4e | 43 | #include "drm_internal.h" |
81065548 | 44 | #include "drm_crtc_internal.h" |
1da177e4 | 45 | |
6dc3e22e EG |
46 | /* |
47 | * drm_debug: Enable debug output. | |
48 | * Bitmask of DRM_UT_x. See include/drm/drmP.h for details. | |
49 | */ | |
50 | unsigned int drm_debug = 0; | |
1da177e4 LT |
51 | EXPORT_SYMBOL(drm_debug); |
52 | ||
82d5e73f DH |
53 | MODULE_AUTHOR("Gareth Hughes, Leif Delgass, José Fonseca, Jon Smirl"); |
54 | MODULE_DESCRIPTION("DRM shared core routines"); | |
1da177e4 | 55 | MODULE_LICENSE("GPL and additional rights"); |
6dc3e22e | 56 | MODULE_PARM_DESC(debug, "Enable debug output, where each bit enables a debug category.\n" |
a18b2192 LP |
57 | "\t\tBit 0 (0x01) will enable CORE messages (drm core code)\n" |
58 | "\t\tBit 1 (0x02) will enable DRIVER messages (drm controller code)\n" | |
59 | "\t\tBit 2 (0x04) will enable KMS messages (modesetting code)\n" | |
60 | "\t\tBit 3 (0x08) will enable PRIME messages (prime code)\n" | |
61 | "\t\tBit 4 (0x10) will enable ATOMIC messages (atomic code)\n" | |
62 | "\t\tBit 5 (0x20) will enable VBL messages (vblank code)\n" | |
63 | "\t\tBit 7 (0x80) will enable LEASE messages (leasing code)\n" | |
64 | "\t\tBit 8 (0x100) will enable DP messages (displayport code)"); | |
c0758146 | 65 | module_param_named(debug, drm_debug, int, 0600); |
1da177e4 | 66 | |
0d639883 | 67 | static DEFINE_SPINLOCK(drm_minor_lock); |
1b7199fe | 68 | static struct idr drm_minors_idr; |
2c14f28b | 69 | |
371c2279 AM |
70 | /* |
71 | * If the drm core fails to init for whatever reason, | |
72 | * we should prevent any drivers from registering with it. | |
73 | * It's best to check this at drm_dev_init(), as some drivers | |
74 | * prefer to embed struct drm_device into their own device | |
75 | * structure and call drm_dev_init() themselves. | |
76 | */ | |
77 | static bool drm_core_init_complete = false; | |
78 | ||
1b7199fe | 79 | static struct dentry *drm_debugfs_root; |
5ad3d883 | 80 | |
bee330f3 NT |
81 | DEFINE_STATIC_SRCU(drm_unplug_srcu); |
82 | ||
0d639883 DH |
83 | /* |
84 | * DRM Minors | |
85 | * A DRM device can provide several char-dev interfaces on the DRM-Major. Each | |
86 | * of them is represented by a drm_minor object. Depending on the capabilities | |
87 | * of the device-driver, different interfaces are registered. | |
1da177e4 | 88 | * |
0d639883 DH |
89 | * Minors can be accessed via dev->$minor_name. This pointer is either |
90 | * NULL or a valid drm_minor pointer and stays valid as long as the device is | |
91 | * valid. This means, DRM minors have the same life-time as the underlying | |
92 | * device. However, this doesn't mean that the minor is active. Minors are | |
93 | * registered and unregistered dynamically according to device-state. | |
1da177e4 | 94 | */ |
0d639883 | 95 | |
05b701f6 DH |
96 | static struct drm_minor **drm_minor_get_slot(struct drm_device *dev, |
97 | unsigned int type) | |
98 | { | |
99 | switch (type) { | |
a3ccc461 | 100 | case DRM_MINOR_PRIMARY: |
05b701f6 DH |
101 | return &dev->primary; |
102 | case DRM_MINOR_RENDER: | |
103 | return &dev->render; | |
05b701f6 | 104 | default: |
3bd07ccd | 105 | BUG(); |
05b701f6 DH |
106 | } |
107 | } | |
108 | ||
109 | static int drm_minor_alloc(struct drm_device *dev, unsigned int type) | |
110 | { | |
111 | struct drm_minor *minor; | |
f1b85962 DH |
112 | unsigned long flags; |
113 | int r; | |
05b701f6 DH |
114 | |
115 | minor = kzalloc(sizeof(*minor), GFP_KERNEL); | |
116 | if (!minor) | |
117 | return -ENOMEM; | |
118 | ||
119 | minor->type = type; | |
120 | minor->dev = dev; | |
05b701f6 | 121 | |
f1b85962 DH |
122 | idr_preload(GFP_KERNEL); |
123 | spin_lock_irqsave(&drm_minor_lock, flags); | |
124 | r = idr_alloc(&drm_minors_idr, | |
125 | NULL, | |
126 | 64 * type, | |
127 | 64 * (type + 1), | |
128 | GFP_NOWAIT); | |
129 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
130 | idr_preload_end(); | |
131 | ||
132 | if (r < 0) | |
133 | goto err_free; | |
134 | ||
135 | minor->index = r; | |
136 | ||
e1728075 DH |
137 | minor->kdev = drm_sysfs_minor_alloc(minor); |
138 | if (IS_ERR(minor->kdev)) { | |
139 | r = PTR_ERR(minor->kdev); | |
140 | goto err_index; | |
141 | } | |
142 | ||
05b701f6 DH |
143 | *drm_minor_get_slot(dev, type) = minor; |
144 | return 0; | |
f1b85962 | 145 | |
e1728075 DH |
146 | err_index: |
147 | spin_lock_irqsave(&drm_minor_lock, flags); | |
148 | idr_remove(&drm_minors_idr, minor->index); | |
149 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
f1b85962 DH |
150 | err_free: |
151 | kfree(minor); | |
152 | return r; | |
05b701f6 DH |
153 | } |
154 | ||
bd9dfa98 DH |
155 | static void drm_minor_free(struct drm_device *dev, unsigned int type) |
156 | { | |
f1b85962 DH |
157 | struct drm_minor **slot, *minor; |
158 | unsigned long flags; | |
bd9dfa98 DH |
159 | |
160 | slot = drm_minor_get_slot(dev, type); | |
f1b85962 DH |
161 | minor = *slot; |
162 | if (!minor) | |
163 | return; | |
164 | ||
e1728075 | 165 | put_device(minor->kdev); |
f1b85962 DH |
166 | |
167 | spin_lock_irqsave(&drm_minor_lock, flags); | |
168 | idr_remove(&drm_minors_idr, minor->index); | |
169 | spin_unlock_irqrestore(&drm_minor_lock, flags); | |
170 | ||
171 | kfree(minor); | |
172 | *slot = NULL; | |
bd9dfa98 DH |
173 | } |
174 | ||
afcdbc86 | 175 | static int drm_minor_register(struct drm_device *dev, unsigned int type) |
1da177e4 | 176 | { |
f1b85962 | 177 | struct drm_minor *minor; |
0d639883 | 178 | unsigned long flags; |
1da177e4 | 179 | int ret; |
1da177e4 LT |
180 | |
181 | DRM_DEBUG("\n"); | |
182 | ||
f1b85962 DH |
183 | minor = *drm_minor_get_slot(dev, type); |
184 | if (!minor) | |
05b701f6 DH |
185 | return 0; |
186 | ||
f1b85962 | 187 | ret = drm_debugfs_init(minor, minor->index, drm_debugfs_root); |
955b12de | 188 | if (ret) { |
156f5a78 | 189 | DRM_ERROR("DRM: Failed to initialize /sys/kernel/debug/dri.\n"); |
a67834f8 | 190 | goto err_debugfs; |
955b12de | 191 | } |
2c14f28b | 192 | |
e1728075 DH |
193 | ret = device_add(minor->kdev); |
194 | if (ret) | |
cb6458f9 | 195 | goto err_debugfs; |
2c14f28b | 196 | |
0d639883 DH |
197 | /* replace NULL with @minor so lookups will succeed from now on */ |
198 | spin_lock_irqsave(&drm_minor_lock, flags); | |
f1b85962 | 199 | idr_replace(&drm_minors_idr, minor, minor->index); |
0d639883 | 200 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
2c14f28b | 201 | |
f1b85962 | 202 | DRM_DEBUG("new minor registered %d\n", minor->index); |
2c14f28b DA |
203 | return 0; |
204 | ||
cb6458f9 | 205 | err_debugfs: |
f1b85962 | 206 | drm_debugfs_cleanup(minor); |
1da177e4 LT |
207 | return ret; |
208 | } | |
b5e89ed5 | 209 | |
afcdbc86 | 210 | static void drm_minor_unregister(struct drm_device *dev, unsigned int type) |
f73aca50 | 211 | { |
afcdbc86 | 212 | struct drm_minor *minor; |
0d639883 | 213 | unsigned long flags; |
afcdbc86 DH |
214 | |
215 | minor = *drm_minor_get_slot(dev, type); | |
e1728075 | 216 | if (!minor || !device_is_registered(minor->kdev)) |
f73aca50 DH |
217 | return; |
218 | ||
f1b85962 | 219 | /* replace @minor with NULL so lookups will fail from now on */ |
0d639883 | 220 | spin_lock_irqsave(&drm_minor_lock, flags); |
f1b85962 | 221 | idr_replace(&drm_minors_idr, NULL, minor->index); |
0d639883 | 222 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
865fb47f | 223 | |
e1728075 DH |
224 | device_del(minor->kdev); |
225 | dev_set_drvdata(minor->kdev, NULL); /* safety belt */ | |
865fb47f | 226 | drm_debugfs_cleanup(minor); |
f73aca50 DH |
227 | } |
228 | ||
85e634bc | 229 | /* |
1616c525 DH |
230 | * Looks up the given minor-ID and returns the respective DRM-minor object. The |
231 | * refence-count of the underlying device is increased so you must release this | |
232 | * object with drm_minor_release(). | |
233 | * | |
234 | * As long as you hold this minor, it is guaranteed that the object and the | |
235 | * minor->dev pointer will stay valid! However, the device may get unplugged and | |
236 | * unregistered while you hold the minor. | |
1da177e4 | 237 | */ |
1616c525 | 238 | struct drm_minor *drm_minor_acquire(unsigned int minor_id) |
1da177e4 | 239 | { |
1616c525 | 240 | struct drm_minor *minor; |
0d639883 | 241 | unsigned long flags; |
1616c525 | 242 | |
0d639883 | 243 | spin_lock_irqsave(&drm_minor_lock, flags); |
1616c525 | 244 | minor = idr_find(&drm_minors_idr, minor_id); |
0d639883 | 245 | if (minor) |
9a96f550 | 246 | drm_dev_get(minor->dev); |
0d639883 DH |
247 | spin_unlock_irqrestore(&drm_minor_lock, flags); |
248 | ||
249 | if (!minor) { | |
250 | return ERR_PTR(-ENODEV); | |
c07dcd61 | 251 | } else if (drm_dev_is_unplugged(minor->dev)) { |
9a96f550 | 252 | drm_dev_put(minor->dev); |
1616c525 | 253 | return ERR_PTR(-ENODEV); |
0d639883 | 254 | } |
673a394b | 255 | |
1616c525 DH |
256 | return minor; |
257 | } | |
b5e89ed5 | 258 | |
1616c525 DH |
259 | void drm_minor_release(struct drm_minor *minor) |
260 | { | |
9a96f550 | 261 | drm_dev_put(minor->dev); |
1da177e4 | 262 | } |
112b715e | 263 | |
6e3f797c DV |
264 | /** |
265 | * DOC: driver instance overview | |
266 | * | |
ea0dd85a | 267 | * A device instance for a drm driver is represented by &struct drm_device. This |
6e3f797c DV |
268 | * is allocated with drm_dev_alloc(), usually from bus-specific ->probe() |
269 | * callbacks implemented by the driver. The driver then needs to initialize all | |
270 | * the various subsystems for the drm device like memory management, vblank | |
271 | * handling, modesetting support and intial output configuration plus obviously | |
a6b5fac5 GH |
272 | * initialize all the corresponding hardware bits. An important part of this is |
273 | * also calling drm_dev_set_unique() to set the userspace-visible unique name of | |
274 | * this device instance. Finally when everything is up and running and ready for | |
275 | * userspace the device instance can be published using drm_dev_register(). | |
6e3f797c DV |
276 | * |
277 | * There is also deprecated support for initalizing device instances using | |
ef40cbf9 | 278 | * bus-specific helpers and the &drm_driver.load callback. But due to |
6e3f797c DV |
279 | * backwards-compatibility needs the device instance have to be published too |
280 | * early, which requires unpretty global locking to make safe and is therefore | |
281 | * only support for existing drivers not yet converted to the new scheme. | |
282 | * | |
283 | * When cleaning up a device instance everything needs to be done in reverse: | |
284 | * First unpublish the device instance with drm_dev_unregister(). Then clean up | |
285 | * any other resources allocated at device initialization and drop the driver's | |
9a96f550 | 286 | * reference to &drm_device using drm_dev_put(). |
6e3f797c DV |
287 | * |
288 | * Note that the lifetime rules for &drm_device instance has still a lot of | |
289 | * historical baggage. Hence use the reference counting provided by | |
9a96f550 | 290 | * drm_dev_get() and drm_dev_put() only carefully. |
6e3f797c | 291 | * |
ea0dd85a | 292 | * It is recommended that drivers embed &struct drm_device into their own device |
d82faafd | 293 | * structure, which is supported through drm_dev_init(). |
6e3f797c DV |
294 | */ |
295 | ||
112b715e | 296 | /** |
c6a1af8a TR |
297 | * drm_put_dev - Unregister and release a DRM device |
298 | * @dev: DRM device | |
112b715e | 299 | * |
c6a1af8a | 300 | * Called at module unload time or when a PCI device is unplugged. |
112b715e | 301 | * |
c6a1af8a | 302 | * Cleans up all DRM device, calling drm_lastclose(). |
6e3f797c DV |
303 | * |
304 | * Note: Use of this function is deprecated. It will eventually go away | |
9a96f550 | 305 | * completely. Please use drm_dev_unregister() and drm_dev_put() explicitly |
6e3f797c DV |
306 | * instead to make sure that the device isn't userspace accessible any more |
307 | * while teardown is in progress, ensuring that userspace can't access an | |
308 | * inconsistent state. | |
112b715e KH |
309 | */ |
310 | void drm_put_dev(struct drm_device *dev) | |
311 | { | |
112b715e KH |
312 | DRM_DEBUG("\n"); |
313 | ||
314 | if (!dev) { | |
315 | DRM_ERROR("cleanup called no dev\n"); | |
316 | return; | |
317 | } | |
318 | ||
c3a49737 | 319 | drm_dev_unregister(dev); |
9a96f550 | 320 | drm_dev_put(dev); |
112b715e KH |
321 | } |
322 | EXPORT_SYMBOL(drm_put_dev); | |
2c07a21d | 323 | |
bee330f3 NT |
324 | /** |
325 | * drm_dev_enter - Enter device critical section | |
326 | * @dev: DRM device | |
327 | * @idx: Pointer to index that will be passed to the matching drm_dev_exit() | |
328 | * | |
329 | * This function marks and protects the beginning of a section that should not | |
330 | * be entered after the device has been unplugged. The section end is marked | |
331 | * with drm_dev_exit(). Calls to this function can be nested. | |
332 | * | |
333 | * Returns: | |
334 | * True if it is OK to enter the section, false otherwise. | |
335 | */ | |
336 | bool drm_dev_enter(struct drm_device *dev, int *idx) | |
c07dcd61 | 337 | { |
bee330f3 NT |
338 | *idx = srcu_read_lock(&drm_unplug_srcu); |
339 | ||
340 | if (dev->unplugged) { | |
341 | srcu_read_unlock(&drm_unplug_srcu, *idx); | |
342 | return false; | |
343 | } | |
344 | ||
345 | return true; | |
c07dcd61 | 346 | } |
bee330f3 NT |
347 | EXPORT_SYMBOL(drm_dev_enter); |
348 | ||
349 | /** | |
350 | * drm_dev_exit - Exit device critical section | |
351 | * @idx: index returned from drm_dev_enter() | |
352 | * | |
353 | * This function marks the end of a section that should not be entered after | |
354 | * the device has been unplugged. | |
355 | */ | |
356 | void drm_dev_exit(int idx) | |
c07dcd61 | 357 | { |
bee330f3 | 358 | srcu_read_unlock(&drm_unplug_srcu, idx); |
c07dcd61 | 359 | } |
bee330f3 | 360 | EXPORT_SYMBOL(drm_dev_exit); |
c07dcd61 DV |
361 | |
362 | /** | |
363 | * drm_dev_unplug - unplug a DRM device | |
364 | * @dev: DRM device | |
365 | * | |
366 | * This unplugs a hotpluggable DRM device, which makes it inaccessible to | |
bee330f3 NT |
367 | * userspace operations. Entry-points can use drm_dev_enter() and |
368 | * drm_dev_exit() to protect device resources in a race free manner. This | |
c07dcd61 DV |
369 | * essentially unregisters the device like drm_dev_unregister(), but can be |
370 | * called while there are still open users of @dev. | |
371 | */ | |
372 | void drm_dev_unplug(struct drm_device *dev) | |
2c07a21d | 373 | { |
bee330f3 NT |
374 | /* |
375 | * After synchronizing any critical read section is guaranteed to see | |
376 | * the new value of ->unplugged, and any critical section which might | |
377 | * still have seen the old value of ->unplugged is guaranteed to have | |
378 | * finished. | |
379 | */ | |
380 | dev->unplugged = true; | |
381 | synchronize_srcu(&drm_unplug_srcu); | |
069035c5 OA |
382 | |
383 | drm_dev_unregister(dev); | |
384 | ||
385 | mutex_lock(&drm_global_mutex); | |
386 | if (dev->open_count == 0) | |
387 | drm_dev_put(dev); | |
388 | mutex_unlock(&drm_global_mutex); | |
2c07a21d | 389 | } |
c07dcd61 | 390 | EXPORT_SYMBOL(drm_dev_unplug); |
1bb72532 | 391 | |
31bbe16f DH |
392 | /* |
393 | * DRM internal mount | |
394 | * We want to be able to allocate our own "struct address_space" to control | |
395 | * memory-mappings in VRAM (or stolen RAM, ...). However, core MM does not allow | |
396 | * stand-alone address_space objects, so we need an underlying inode. As there | |
397 | * is no way to allocate an independent inode easily, we need a fake internal | |
398 | * VFS mount-point. | |
399 | * | |
400 | * The drm_fs_inode_new() function allocates a new inode, drm_fs_inode_free() | |
401 | * frees it again. You are allowed to use iget() and iput() to get references to | |
402 | * the inode. But each drm_fs_inode_new() call must be paired with exactly one | |
403 | * drm_fs_inode_free() call (which does not have to be the last iput()). | |
404 | * We use drm_fs_inode_*() to manage our internal VFS mount-point and share it | |
405 | * between multiple inode-users. You could, technically, call | |
406 | * iget() + drm_fs_inode_free() directly after alloc and sometime later do an | |
407 | * iput(), but this way you'd end up with a new vfsmount for each inode. | |
408 | */ | |
409 | ||
410 | static int drm_fs_cnt; | |
411 | static struct vfsmount *drm_fs_mnt; | |
412 | ||
413 | static const struct dentry_operations drm_fs_dops = { | |
414 | .d_dname = simple_dname, | |
415 | }; | |
416 | ||
417 | static const struct super_operations drm_fs_sops = { | |
418 | .statfs = simple_statfs, | |
419 | }; | |
420 | ||
421 | static struct dentry *drm_fs_mount(struct file_system_type *fs_type, int flags, | |
422 | const char *dev_name, void *data) | |
423 | { | |
424 | return mount_pseudo(fs_type, | |
425 | "drm:", | |
426 | &drm_fs_sops, | |
427 | &drm_fs_dops, | |
428 | 0x010203ff); | |
429 | } | |
430 | ||
431 | static struct file_system_type drm_fs_type = { | |
432 | .name = "drm", | |
433 | .owner = THIS_MODULE, | |
434 | .mount = drm_fs_mount, | |
435 | .kill_sb = kill_anon_super, | |
436 | }; | |
437 | ||
438 | static struct inode *drm_fs_inode_new(void) | |
439 | { | |
440 | struct inode *inode; | |
441 | int r; | |
442 | ||
443 | r = simple_pin_fs(&drm_fs_type, &drm_fs_mnt, &drm_fs_cnt); | |
444 | if (r < 0) { | |
445 | DRM_ERROR("Cannot mount pseudo fs: %d\n", r); | |
446 | return ERR_PTR(r); | |
447 | } | |
448 | ||
449 | inode = alloc_anon_inode(drm_fs_mnt->mnt_sb); | |
450 | if (IS_ERR(inode)) | |
451 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
452 | ||
453 | return inode; | |
454 | } | |
455 | ||
456 | static void drm_fs_inode_free(struct inode *inode) | |
457 | { | |
458 | if (inode) { | |
459 | iput(inode); | |
460 | simple_release_fs(&drm_fs_mnt, &drm_fs_cnt); | |
461 | } | |
462 | } | |
463 | ||
1bb72532 | 464 | /** |
b209aca3 CW |
465 | * drm_dev_init - Initialise new DRM device |
466 | * @dev: DRM device | |
467 | * @driver: DRM driver | |
1bb72532 DH |
468 | * @parent: Parent device object |
469 | * | |
b209aca3 | 470 | * Initialize a new DRM device. No device registration is done. |
c22f0ace | 471 | * Call drm_dev_register() to advertice the device to user space and register it |
6e3f797c DV |
472 | * with other core subsystems. This should be done last in the device |
473 | * initialization sequence to make sure userspace can't access an inconsistent | |
474 | * state. | |
1bb72532 | 475 | * |
9a96f550 AP |
476 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
477 | * drm_dev_put() to take and drop further ref-counts. | |
099d1c29 | 478 | * |
b0ff4b93 DV |
479 | * Note that for purely virtual devices @parent can be NULL. |
480 | * | |
b209aca3 | 481 | * Drivers that do not want to allocate their own device struct |
ea0dd85a DV |
482 | * embedding &struct drm_device can call drm_dev_alloc() instead. For drivers |
483 | * that do embed &struct drm_device it must be placed first in the overall | |
d82faafd DV |
484 | * structure, and the overall structure must be allocated using kmalloc(): The |
485 | * drm core's release function unconditionally calls kfree() on the @dev pointer | |
f30c9257 CW |
486 | * when the final reference is released. To override this behaviour, and so |
487 | * allow embedding of the drm_device inside the driver's device struct at an | |
488 | * arbitrary offset, you must supply a &drm_driver.release callback and control | |
489 | * the finalization explicitly. | |
b209aca3 | 490 | * |
1bb72532 | 491 | * RETURNS: |
b209aca3 | 492 | * 0 on success, or error code on failure. |
1bb72532 | 493 | */ |
b209aca3 CW |
494 | int drm_dev_init(struct drm_device *dev, |
495 | struct drm_driver *driver, | |
496 | struct device *parent) | |
1bb72532 | 497 | { |
1bb72532 DH |
498 | int ret; |
499 | ||
371c2279 AM |
500 | if (!drm_core_init_complete) { |
501 | DRM_ERROR("DRM core is not initialized\n"); | |
502 | return -ENODEV; | |
503 | } | |
504 | ||
099d1c29 | 505 | kref_init(&dev->ref); |
1bb72532 DH |
506 | dev->dev = parent; |
507 | dev->driver = driver; | |
508 | ||
509 | INIT_LIST_HEAD(&dev->filelist); | |
c76f0f7c NT |
510 | INIT_LIST_HEAD(&dev->filelist_internal); |
511 | INIT_LIST_HEAD(&dev->clientlist); | |
1bb72532 DH |
512 | INIT_LIST_HEAD(&dev->ctxlist); |
513 | INIT_LIST_HEAD(&dev->vmalist); | |
514 | INIT_LIST_HEAD(&dev->maplist); | |
515 | INIT_LIST_HEAD(&dev->vblank_event_list); | |
516 | ||
2177a218 | 517 | spin_lock_init(&dev->buf_lock); |
1bb72532 DH |
518 | spin_lock_init(&dev->event_lock); |
519 | mutex_init(&dev->struct_mutex); | |
1d2ac403 | 520 | mutex_init(&dev->filelist_mutex); |
c76f0f7c | 521 | mutex_init(&dev->clientlist_mutex); |
1bb72532 | 522 | mutex_init(&dev->ctxlist_mutex); |
c996fd0b | 523 | mutex_init(&dev->master_mutex); |
1bb72532 | 524 | |
6796cb16 DH |
525 | dev->anon_inode = drm_fs_inode_new(); |
526 | if (IS_ERR(dev->anon_inode)) { | |
527 | ret = PTR_ERR(dev->anon_inode); | |
528 | DRM_ERROR("Cannot allocate anonymous inode: %d\n", ret); | |
1bb72532 | 529 | goto err_free; |
6796cb16 DH |
530 | } |
531 | ||
6d6dfcfb | 532 | if (drm_core_check_feature(dev, DRIVER_RENDER)) { |
05b701f6 DH |
533 | ret = drm_minor_alloc(dev, DRM_MINOR_RENDER); |
534 | if (ret) | |
535 | goto err_minors; | |
536 | } | |
537 | ||
a3ccc461 | 538 | ret = drm_minor_alloc(dev, DRM_MINOR_PRIMARY); |
05b701f6 DH |
539 | if (ret) |
540 | goto err_minors; | |
541 | ||
b209aca3 CW |
542 | ret = drm_ht_create(&dev->map_hash, 12); |
543 | if (ret) | |
05b701f6 | 544 | goto err_minors; |
1bb72532 | 545 | |
ba6976c1 | 546 | drm_legacy_ctxbitmap_init(dev); |
1bb72532 | 547 | |
1bcecfac | 548 | if (drm_core_check_feature(dev, DRIVER_GEM)) { |
1bb72532 DH |
549 | ret = drm_gem_init(dev); |
550 | if (ret) { | |
551 | DRM_ERROR("Cannot initialize graphics execution manager (GEM)\n"); | |
552 | goto err_ctxbitmap; | |
553 | } | |
554 | } | |
555 | ||
5079c464 DV |
556 | /* Use the parent device name as DRM device unique identifier, but fall |
557 | * back to the driver name for virtual devices like vgem. */ | |
558 | ret = drm_dev_set_unique(dev, parent ? dev_name(parent) : driver->name); | |
559 | if (ret) | |
560 | goto err_setunique; | |
e112e593 | 561 | |
b209aca3 | 562 | return 0; |
1bb72532 | 563 | |
e112e593 NI |
564 | err_setunique: |
565 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
566 | drm_gem_destroy(dev); | |
1bb72532 | 567 | err_ctxbitmap: |
e7b96070 | 568 | drm_legacy_ctxbitmap_cleanup(dev); |
1bb72532 | 569 | drm_ht_remove(&dev->map_hash); |
05b701f6 | 570 | err_minors: |
a3ccc461 | 571 | drm_minor_free(dev, DRM_MINOR_PRIMARY); |
bd9dfa98 | 572 | drm_minor_free(dev, DRM_MINOR_RENDER); |
6796cb16 | 573 | drm_fs_inode_free(dev->anon_inode); |
1bb72532 | 574 | err_free: |
c996fd0b | 575 | mutex_destroy(&dev->master_mutex); |
f92e1ee5 | 576 | mutex_destroy(&dev->ctxlist_mutex); |
c76f0f7c | 577 | mutex_destroy(&dev->clientlist_mutex); |
f92e1ee5 JL |
578 | mutex_destroy(&dev->filelist_mutex); |
579 | mutex_destroy(&dev->struct_mutex); | |
b209aca3 CW |
580 | return ret; |
581 | } | |
582 | EXPORT_SYMBOL(drm_dev_init); | |
583 | ||
f30c9257 CW |
584 | /** |
585 | * drm_dev_fini - Finalize a dead DRM device | |
586 | * @dev: DRM device | |
587 | * | |
588 | * Finalize a dead DRM device. This is the converse to drm_dev_init() and | |
589 | * frees up all data allocated by it. All driver private data should be | |
590 | * finalized first. Note that this function does not free the @dev, that is | |
591 | * left to the caller. | |
592 | * | |
593 | * The ref-count of @dev must be zero, and drm_dev_fini() should only be called | |
594 | * from a &drm_driver.release callback. | |
595 | */ | |
596 | void drm_dev_fini(struct drm_device *dev) | |
597 | { | |
598 | drm_vblank_cleanup(dev); | |
599 | ||
600 | if (drm_core_check_feature(dev, DRIVER_GEM)) | |
601 | drm_gem_destroy(dev); | |
602 | ||
603 | drm_legacy_ctxbitmap_cleanup(dev); | |
604 | drm_ht_remove(&dev->map_hash); | |
605 | drm_fs_inode_free(dev->anon_inode); | |
606 | ||
607 | drm_minor_free(dev, DRM_MINOR_PRIMARY); | |
608 | drm_minor_free(dev, DRM_MINOR_RENDER); | |
f30c9257 CW |
609 | |
610 | mutex_destroy(&dev->master_mutex); | |
611 | mutex_destroy(&dev->ctxlist_mutex); | |
c76f0f7c | 612 | mutex_destroy(&dev->clientlist_mutex); |
f30c9257 CW |
613 | mutex_destroy(&dev->filelist_mutex); |
614 | mutex_destroy(&dev->struct_mutex); | |
615 | kfree(dev->unique); | |
616 | } | |
617 | EXPORT_SYMBOL(drm_dev_fini); | |
618 | ||
b209aca3 CW |
619 | /** |
620 | * drm_dev_alloc - Allocate new DRM device | |
621 | * @driver: DRM driver to allocate device for | |
622 | * @parent: Parent device object | |
623 | * | |
624 | * Allocate and initialize a new DRM device. No device registration is done. | |
625 | * Call drm_dev_register() to advertice the device to user space and register it | |
626 | * with other core subsystems. This should be done last in the device | |
627 | * initialization sequence to make sure userspace can't access an inconsistent | |
628 | * state. | |
629 | * | |
9a96f550 AP |
630 | * The initial ref-count of the object is 1. Use drm_dev_get() and |
631 | * drm_dev_put() to take and drop further ref-counts. | |
b209aca3 CW |
632 | * |
633 | * Note that for purely virtual devices @parent can be NULL. | |
634 | * | |
ea0dd85a | 635 | * Drivers that wish to subclass or embed &struct drm_device into their |
b209aca3 CW |
636 | * own struct should look at using drm_dev_init() instead. |
637 | * | |
638 | * RETURNS: | |
0f288605 | 639 | * Pointer to new DRM device, or ERR_PTR on failure. |
b209aca3 CW |
640 | */ |
641 | struct drm_device *drm_dev_alloc(struct drm_driver *driver, | |
642 | struct device *parent) | |
643 | { | |
644 | struct drm_device *dev; | |
645 | int ret; | |
646 | ||
647 | dev = kzalloc(sizeof(*dev), GFP_KERNEL); | |
648 | if (!dev) | |
0f288605 | 649 | return ERR_PTR(-ENOMEM); |
b209aca3 CW |
650 | |
651 | ret = drm_dev_init(dev, driver, parent); | |
652 | if (ret) { | |
653 | kfree(dev); | |
0f288605 | 654 | return ERR_PTR(ret); |
b209aca3 CW |
655 | } |
656 | ||
657 | return dev; | |
1bb72532 DH |
658 | } |
659 | EXPORT_SYMBOL(drm_dev_alloc); | |
c22f0ace | 660 | |
099d1c29 | 661 | static void drm_dev_release(struct kref *ref) |
0dc8fe59 | 662 | { |
099d1c29 | 663 | struct drm_device *dev = container_of(ref, struct drm_device, ref); |
8f6599da | 664 | |
f30c9257 CW |
665 | if (dev->driver->release) { |
666 | dev->driver->release(dev); | |
667 | } else { | |
668 | drm_dev_fini(dev); | |
669 | kfree(dev); | |
670 | } | |
0dc8fe59 | 671 | } |
099d1c29 DH |
672 | |
673 | /** | |
9a96f550 | 674 | * drm_dev_get - Take reference of a DRM device |
099d1c29 DH |
675 | * @dev: device to take reference of or NULL |
676 | * | |
677 | * This increases the ref-count of @dev by one. You *must* already own a | |
9a96f550 | 678 | * reference when calling this. Use drm_dev_put() to drop this reference |
099d1c29 DH |
679 | * again. |
680 | * | |
681 | * This function never fails. However, this function does not provide *any* | |
682 | * guarantee whether the device is alive or running. It only provides a | |
683 | * reference to the object and the memory associated with it. | |
684 | */ | |
9a96f550 | 685 | void drm_dev_get(struct drm_device *dev) |
099d1c29 DH |
686 | { |
687 | if (dev) | |
688 | kref_get(&dev->ref); | |
689 | } | |
9a96f550 | 690 | EXPORT_SYMBOL(drm_dev_get); |
099d1c29 DH |
691 | |
692 | /** | |
9a96f550 | 693 | * drm_dev_put - Drop reference of a DRM device |
099d1c29 DH |
694 | * @dev: device to drop reference of or NULL |
695 | * | |
696 | * This decreases the ref-count of @dev by one. The device is destroyed if the | |
697 | * ref-count drops to zero. | |
698 | */ | |
9a96f550 | 699 | void drm_dev_put(struct drm_device *dev) |
099d1c29 DH |
700 | { |
701 | if (dev) | |
702 | kref_put(&dev->ref, drm_dev_release); | |
703 | } | |
9a96f550 AP |
704 | EXPORT_SYMBOL(drm_dev_put); |
705 | ||
706 | /** | |
707 | * drm_dev_unref - Drop reference of a DRM device | |
708 | * @dev: device to drop reference of or NULL | |
709 | * | |
710 | * This is a compatibility alias for drm_dev_put() and should not be used by new | |
711 | * code. | |
712 | */ | |
713 | void drm_dev_unref(struct drm_device *dev) | |
714 | { | |
715 | drm_dev_put(dev); | |
716 | } | |
099d1c29 | 717 | EXPORT_SYMBOL(drm_dev_unref); |
0dc8fe59 | 718 | |
6449b088 DV |
719 | static int create_compat_control_link(struct drm_device *dev) |
720 | { | |
721 | struct drm_minor *minor; | |
722 | char *name; | |
723 | int ret; | |
724 | ||
725 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
726 | return 0; | |
727 | ||
728 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
729 | if (!minor) | |
730 | return 0; | |
731 | ||
732 | /* | |
733 | * Some existing userspace out there uses the existing of the controlD* | |
734 | * sysfs files to figure out whether it's a modeset driver. It only does | |
735 | * readdir, hence a symlink is sufficient (and the least confusing | |
736 | * option). Otherwise controlD* is entirely unused. | |
737 | * | |
738 | * Old controlD chardev have been allocated in the range | |
739 | * 64-127. | |
740 | */ | |
741 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); | |
742 | if (!name) | |
743 | return -ENOMEM; | |
744 | ||
745 | ret = sysfs_create_link(minor->kdev->kobj.parent, | |
746 | &minor->kdev->kobj, | |
747 | name); | |
748 | ||
749 | kfree(name); | |
750 | ||
751 | return ret; | |
752 | } | |
753 | ||
754 | static void remove_compat_control_link(struct drm_device *dev) | |
755 | { | |
756 | struct drm_minor *minor; | |
757 | char *name; | |
758 | ||
759 | if (!drm_core_check_feature(dev, DRIVER_MODESET)) | |
760 | return; | |
761 | ||
762 | minor = *drm_minor_get_slot(dev, DRM_MINOR_PRIMARY); | |
763 | if (!minor) | |
764 | return; | |
765 | ||
7f6df440 | 766 | name = kasprintf(GFP_KERNEL, "controlD%d", minor->index + 64); |
6449b088 DV |
767 | if (!name) |
768 | return; | |
769 | ||
770 | sysfs_remove_link(minor->kdev->kobj.parent, name); | |
771 | ||
772 | kfree(name); | |
773 | } | |
774 | ||
c22f0ace DH |
775 | /** |
776 | * drm_dev_register - Register DRM device | |
777 | * @dev: Device to register | |
c6a1af8a | 778 | * @flags: Flags passed to the driver's .load() function |
c22f0ace DH |
779 | * |
780 | * Register the DRM device @dev with the system, advertise device to user-space | |
781 | * and start normal device operation. @dev must be allocated via drm_dev_alloc() | |
e28cd4d0 | 782 | * previously. |
c22f0ace DH |
783 | * |
784 | * Never call this twice on any device! | |
785 | * | |
6e3f797c | 786 | * NOTE: To ensure backward compatibility with existing drivers method this |
ef40cbf9 DV |
787 | * function calls the &drm_driver.load method after registering the device |
788 | * nodes, creating race conditions. Usage of the &drm_driver.load methods is | |
789 | * therefore deprecated, drivers must perform all initialization before calling | |
6e3f797c DV |
790 | * drm_dev_register(). |
791 | * | |
c22f0ace DH |
792 | * RETURNS: |
793 | * 0 on success, negative error code on failure. | |
794 | */ | |
795 | int drm_dev_register(struct drm_device *dev, unsigned long flags) | |
796 | { | |
75f6dfe3 | 797 | struct drm_driver *driver = dev->driver; |
c22f0ace DH |
798 | int ret; |
799 | ||
800 | mutex_lock(&drm_global_mutex); | |
801 | ||
afcdbc86 | 802 | ret = drm_minor_register(dev, DRM_MINOR_RENDER); |
05b701f6 DH |
803 | if (ret) |
804 | goto err_minors; | |
c22f0ace | 805 | |
a3ccc461 | 806 | ret = drm_minor_register(dev, DRM_MINOR_PRIMARY); |
c22f0ace | 807 | if (ret) |
05b701f6 | 808 | goto err_minors; |
c22f0ace | 809 | |
6449b088 DV |
810 | ret = create_compat_control_link(dev); |
811 | if (ret) | |
812 | goto err_minors; | |
813 | ||
e6e7b48b DV |
814 | dev->registered = true; |
815 | ||
c22f0ace DH |
816 | if (dev->driver->load) { |
817 | ret = dev->driver->load(dev, flags); | |
818 | if (ret) | |
05b701f6 | 819 | goto err_minors; |
c22f0ace DH |
820 | } |
821 | ||
bee7fb15 | 822 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 823 | drm_modeset_register_all(dev); |
e28cd4d0 | 824 | |
c22f0ace | 825 | ret = 0; |
75f6dfe3 GKB |
826 | |
827 | DRM_INFO("Initialized %s %d.%d.%d %s for %s on minor %d\n", | |
828 | driver->name, driver->major, driver->minor, | |
6098909c CW |
829 | driver->patchlevel, driver->date, |
830 | dev->dev ? dev_name(dev->dev) : "virtual device", | |
75f6dfe3 GKB |
831 | dev->primary->index); |
832 | ||
c22f0ace DH |
833 | goto out_unlock; |
834 | ||
05b701f6 | 835 | err_minors: |
6449b088 | 836 | remove_compat_control_link(dev); |
a3ccc461 | 837 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 838 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c22f0ace DH |
839 | out_unlock: |
840 | mutex_unlock(&drm_global_mutex); | |
841 | return ret; | |
842 | } | |
843 | EXPORT_SYMBOL(drm_dev_register); | |
c3a49737 DH |
844 | |
845 | /** | |
846 | * drm_dev_unregister - Unregister DRM device | |
847 | * @dev: Device to unregister | |
848 | * | |
849 | * Unregister the DRM device from the system. This does the reverse of | |
850 | * drm_dev_register() but does not deallocate the device. The caller must call | |
9a96f550 | 851 | * drm_dev_put() to drop their final reference. |
6e3f797c | 852 | * |
c07dcd61 DV |
853 | * A special form of unregistering for hotpluggable devices is drm_dev_unplug(), |
854 | * which can be called while there are still open users of @dev. | |
855 | * | |
6e3f797c DV |
856 | * This should be called first in the device teardown code to make sure |
857 | * userspace can't access the device instance any more. | |
c3a49737 DH |
858 | */ |
859 | void drm_dev_unregister(struct drm_device *dev) | |
860 | { | |
861 | struct drm_map_list *r_list, *list_temp; | |
862 | ||
2e45eeac DV |
863 | if (drm_core_check_feature(dev, DRIVER_LEGACY)) |
864 | drm_lastclose(dev); | |
c3a49737 | 865 | |
e6e7b48b DV |
866 | dev->registered = false; |
867 | ||
c76f0f7c NT |
868 | drm_client_dev_unregister(dev); |
869 | ||
bee7fb15 | 870 | if (drm_core_check_feature(dev, DRIVER_MODESET)) |
79190ea2 | 871 | drm_modeset_unregister_all(dev); |
e28cd4d0 | 872 | |
c3a49737 DH |
873 | if (dev->driver->unload) |
874 | dev->driver->unload(dev); | |
875 | ||
4efafebe DV |
876 | if (dev->agp) |
877 | drm_pci_agp_destroy(dev); | |
c3a49737 | 878 | |
c3a49737 | 879 | list_for_each_entry_safe(r_list, list_temp, &dev->maplist, head) |
9fc5cde7 | 880 | drm_legacy_rmmap(dev, r_list->map); |
c3a49737 | 881 | |
6449b088 | 882 | remove_compat_control_link(dev); |
a3ccc461 | 883 | drm_minor_unregister(dev, DRM_MINOR_PRIMARY); |
afcdbc86 | 884 | drm_minor_unregister(dev, DRM_MINOR_RENDER); |
c3a49737 DH |
885 | } |
886 | EXPORT_SYMBOL(drm_dev_unregister); | |
ca8e2ad7 | 887 | |
a6b5fac5 GH |
888 | /** |
889 | * drm_dev_set_unique - Set the unique name of a DRM device | |
890 | * @dev: device of which to set the unique name | |
891 | * @name: unique name | |
892 | * | |
893 | * Sets the unique name of a DRM device using the specified string. Drivers | |
894 | * can use this at driver probe time if the unique name of the devices they | |
895 | * drive is static. | |
896 | * | |
897 | * Return: 0 on success or a negative error code on failure. | |
898 | */ | |
899 | int drm_dev_set_unique(struct drm_device *dev, const char *name) | |
900 | { | |
901 | kfree(dev->unique); | |
902 | dev->unique = kstrdup(name, GFP_KERNEL); | |
903 | ||
904 | return dev->unique ? 0 : -ENOMEM; | |
905 | } | |
906 | EXPORT_SYMBOL(drm_dev_set_unique); | |
907 | ||
1b7199fe DH |
908 | /* |
909 | * DRM Core | |
910 | * The DRM core module initializes all global DRM objects and makes them | |
911 | * available to drivers. Once setup, drivers can probe their respective | |
912 | * devices. | |
913 | * Currently, core management includes: | |
914 | * - The "DRM-Global" key/value database | |
915 | * - Global ID management for connectors | |
916 | * - DRM major number allocation | |
917 | * - DRM minor management | |
918 | * - DRM sysfs class | |
919 | * - DRM debugfs root | |
920 | * | |
921 | * Furthermore, the DRM core provides dynamic char-dev lookups. For each | |
922 | * interface registered on a DRM device, you can request minor numbers from DRM | |
923 | * core. DRM core takes care of major-number management and char-dev | |
924 | * registration. A stub ->open() callback forwards any open() requests to the | |
925 | * registered minor. | |
926 | */ | |
927 | ||
928 | static int drm_stub_open(struct inode *inode, struct file *filp) | |
929 | { | |
930 | const struct file_operations *new_fops; | |
931 | struct drm_minor *minor; | |
932 | int err; | |
933 | ||
934 | DRM_DEBUG("\n"); | |
935 | ||
936 | mutex_lock(&drm_global_mutex); | |
937 | minor = drm_minor_acquire(iminor(inode)); | |
938 | if (IS_ERR(minor)) { | |
939 | err = PTR_ERR(minor); | |
940 | goto out_unlock; | |
941 | } | |
942 | ||
943 | new_fops = fops_get(minor->dev->driver->fops); | |
944 | if (!new_fops) { | |
945 | err = -ENODEV; | |
946 | goto out_release; | |
947 | } | |
948 | ||
949 | replace_fops(filp, new_fops); | |
950 | if (filp->f_op->open) | |
951 | err = filp->f_op->open(inode, filp); | |
952 | else | |
953 | err = 0; | |
954 | ||
955 | out_release: | |
956 | drm_minor_release(minor); | |
957 | out_unlock: | |
958 | mutex_unlock(&drm_global_mutex); | |
959 | return err; | |
960 | } | |
961 | ||
962 | static const struct file_operations drm_stub_fops = { | |
963 | .owner = THIS_MODULE, | |
964 | .open = drm_stub_open, | |
965 | .llseek = noop_llseek, | |
966 | }; | |
967 | ||
2cc107dc DH |
968 | static void drm_core_exit(void) |
969 | { | |
970 | unregister_chrdev(DRM_MAJOR, "drm"); | |
971 | debugfs_remove(drm_debugfs_root); | |
972 | drm_sysfs_destroy(); | |
973 | idr_destroy(&drm_minors_idr); | |
974 | drm_connector_ida_destroy(); | |
975 | drm_global_release(); | |
976 | } | |
977 | ||
1b7199fe DH |
978 | static int __init drm_core_init(void) |
979 | { | |
2cc107dc | 980 | int ret; |
1b7199fe DH |
981 | |
982 | drm_global_init(); | |
983 | drm_connector_ida_init(); | |
984 | idr_init(&drm_minors_idr); | |
985 | ||
fcc90213 DH |
986 | ret = drm_sysfs_init(); |
987 | if (ret < 0) { | |
2cc107dc DH |
988 | DRM_ERROR("Cannot create DRM class: %d\n", ret); |
989 | goto error; | |
1b7199fe DH |
990 | } |
991 | ||
992 | drm_debugfs_root = debugfs_create_dir("dri", NULL); | |
993 | if (!drm_debugfs_root) { | |
2cc107dc DH |
994 | ret = -ENOMEM; |
995 | DRM_ERROR("Cannot create debugfs-root: %d\n", ret); | |
996 | goto error; | |
1b7199fe DH |
997 | } |
998 | ||
2cc107dc DH |
999 | ret = register_chrdev(DRM_MAJOR, "drm", &drm_stub_fops); |
1000 | if (ret < 0) | |
1001 | goto error; | |
1002 | ||
371c2279 AM |
1003 | drm_core_init_complete = true; |
1004 | ||
e82dfa00 | 1005 | DRM_DEBUG("Initialized\n"); |
1b7199fe | 1006 | return 0; |
1b7199fe | 1007 | |
2cc107dc DH |
1008 | error: |
1009 | drm_core_exit(); | |
1b7199fe DH |
1010 | return ret; |
1011 | } | |
1012 | ||
1b7199fe DH |
1013 | module_init(drm_core_init); |
1014 | module_exit(drm_core_exit); |